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Published December 1983 | public
Journal Article

Microearthquake seismicity and active tectonics of northwestern Greece

Abstract

We carried out a microearthquake survey lasting for six weeks in northwest Greece using 18 portable seismograph stations to examine a region in which normal and thrust faulting have been reported in close proximity to one another. With this array we located 148 events and determined fault plane solutions for eight events using only rays radiated upwards. The seismicity of the region is diffuse with events extending to depths of nearly 30 km, and there is a minimum in activity near a depth of 15 km. The fault plane solutions exhibit a wide spectrum of fault types and orientations and are not consistent with simple zones of shortening or extension. Neither tractions applied to the edges or bottom of the region nor deviatoric stresses that compensate for lateral variations in crustal thickness can account for the variety of fault plane solutions. We think that the complicated behavior is a manifestation of inhomogeneous deformation due, at least in part, to a pre-existing complicated juxtaposition of structures and formations.

Additional Information

© 1983 Elsevier Science Publishers B.V. Received June 21, 1983 Revised version received September 20, 1983. We thank B. Papazachos and P. Voidomatis for field and logistic support, Diana and Peter King and Peter Sherwood for helping operate the instruments, M. Barazangi and D. Hatzfeld for critically reviewing the manuscript, and D. Frank for typing it. The project was supported by the National Environment Research Council GR3/3904 and the H.O. Wood fund of the Carnegie Institution of Washington, D.C. This is Cambridge Earth Sciences Contribution Number ES389.

Additional details

Created:
August 19, 2023
Modified:
October 17, 2023